When designing forms make sure the response mechanism is appropriate to each question. Having gone to all the trouble of filling in your form, the least you can do is provide users with information about what happens next. Customer communication is key, and since you have made the form so easy to fill in and return, processing it could also be a breeze!

It is similarly annoying to them when it is a long free text box, making the customer question whether they are answering correctly and sufficiently. Providing response boxes that reflect the anticipated answer length and format reassures people that they are filling them in correctly.